Some years ago, while digging through my father's toolbox getting some nails, I noticed these copper things that had two holds and a nice big gap inside the middle, that I later found out was a two-hole conduit strap/hanger used to hold pipes (also called EMT straps). I then had the great idea to drill holes in my desk and run wires through them, for clean wire-management. Turns out, it worked out really well. So well, I decided to buy a pack of 100 and use them to wire my new desk in LA.
The result, a clean desk with no wires resting below the desk nor on top... it definitely satisfies my OCD for cleanliness. :P